4. A lumped system has a Bi number equal to 0.05. It is made of a material with density of 1300 kg/m3, thermal conductivity of 200 W/m K, and specific heat of 300 J/kg K. If the system is exposed to a convection environment with h = 70 W/m² K, what is the time constant for this system? Express your answer in minutes.

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
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Author:Kreith, Frank; Manglik, Raj M.
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Chapter2: Steady Heat Conduction
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Problem 2.15P: 2.15 Suppose that a pipe carrying a hot fluid with an external temperature of and outer radius is...
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4. A lumped system has a Bi number equal to 0.05. It is made of a material with density of 1300 kg/m3, thermal conductivity of 200 W/m K, and specific heat of 300 J/kg K. If the system is exposed to a convection environment with h = 70 W/m² K, what is the time constant for this system? Express your answer in minutes.

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